20843275807831 has 4 divisors (see below), whose sum is σ = 20844346745232. Its totient is φ = 20842204870432.

The previous prime is 20843275807763. The next prime is 20843275807877. The reversal of 20843275807831 is 13870857234802.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20843275807831 - 2¹⁷ = 20843275676759 is a prime.

It is a super-2 number, since 2×20843275807831² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20843275807331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 535439506 + ... + 535478431.

It is an arithmetic number, because the mean of its divisors is an integer number (5211086686308).

Almost surely, 2^{20843275807831} is an apocalyptic number.

20843275807831 is a deficient number, since it is larger than the sum of its proper divisors (1070937401).

20843275807831 is a wasteful number, since it uses less digits than its factorization.

20843275807831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1070937400.

The product of its (nonzero) digits is 18063360, while the sum is 58.

The spelling of 20843275807831 in words is "twenty trillion, eight hundred forty-three billion, two hundred seventy-five million, eight hundred seven thousand, eight hundred thirty-one".